<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <script type="text/javascript">
    function tulin(say) {
      var say = say;
       switch (say) {
         case '土豆':
          console.log('呦');
           break;
           case '呦':
            console.log('切克闹');
             break;
         default:

       }

    }
    tulin('土豆');
    tulin('呦');
    </script>
  </body>
</html>
